Home / 2,080.18-3,120.88-781.75

Finding the Fourth Proportional to 2,080.18, 3,120.88 and 781.75

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Solution

The fourth proportional to 2,080.18, 3,120.88 and 781.75 is: 1,172.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.18 : 3,120.88 = 781.75 : x
  2. Step 2: Convert to fraction form
    2,080.18/3,120.88 = 781.75/x
  3. Step 3: Cross multiply
    2,080.18x = 3,120.88 × 781.75
  4. Step 4: Simplify right side
    2,080.18x = 2,439,747.94
  5. Step 5: Solve for x
    x = 2,439,747.94/2,080.18
  6. Step 6: Final answer
    x = 1,172.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.